Shop clamps are used to bind two sets of material together in order to keep them secure. They're commonly used to keep molds together when working with resin, for keeping pieces of steel close together for welding.
What is a pipe clamp used for?
Pipe clamps are a set of clamp heads connected by a length of threaded pipe. The capacity of the clamp is determined by the length of the pipe, and they can be used to create wooden laminations.